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9. TROUBLESHOOTING
9. FEHLERSUCHE
9. RESOLUTION DES PROBLEMES
9. LOCALIZACION DE AVERIAS
9. TROUBLESHOOTING
Turn off the power switch and disconnect the power cord before carrying out troubleshooting,
otherwise the machine may operate if the treadle is depressed by mistake, which could result in injury.
* The motor will keep turning even after the power is switched off as a result of the motor's inertia.
Wait until the motor stops fully before starting work.
Problem
Upper thread breaks
Lower thread breaks
Skipped stitches
79
CAUTION
Cause
Needle bent or blunt.
Needle is incorrectly
installed.
Threading is incorrect.
Upper thread tension is
too strong.
Needle
and
rotary
hook
timing
is
incorrect.
Lower thread tension is
too strong.
Oil
and
lint
stick
around
the
bobbin
case.
Needle bent or blunt.
Needle is incorrectly
installed.
Threading is incorrect.
Needle
and
rotary
hook
timing
is
incorrect.
Check
Needle
Needle position
Threading
Main
and
auxiliary
tension
Needle
and
rotary
hook timing
Lower thread tension
Bobbin case
Needle
Needle position
Threading
Needle
and
rotary
hook timing
HM-8180
Remedy
Replace the needle.
Install
the
needle
correctly.
Thread
the
upper
thread correctly.
Adjust
to
an
appropriate tension.
Adjust the timing of the
needle
and
rotary
hook.
Adjust
to
an
appropriate tension.
Remove lint and wipe
off oil.
Replace the needle.
Install
the
needle
correctly.
Thread
the
upper
thread correctly.
Adjust the timing of the
needle
and
rotary
hook.
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